iPhone Game Engines

I'm working on Kobold2D (http://www.kobold2d.com), an improved version of Cocos2D featuring a lot more sample code, much better documentation and a serious effort to improve cross-platform (iOS & Mac OS) support.

I also want to provide a much more streamlined experience for beginning developers, starting with an installer, tools to create new projects from the 15+ template projects and upgrading projects to newer versions of Kobold2D is also just a mouse-click. API improvements are made to make programming games easier, for example KKInput significantly simplifies how you work with user input states (keyboard, mouse, accelerometer, gyroscope, touches and gestures).

Great iPhone game engines given on this post but as per the my best iPhone game engine concern I would like to say that Unity 3D is one of my best game engine. Thanks for sharing nice iPhone game engine.